1315816639 has 2 divisors, whose sum is σ = 1315816640. Its totient is φ = 1315816638.

The previous prime is 1315816627. The next prime is 1315816693. The reversal of 1315816639 is 9366185131.

It is a happy number.

Together with next prime (1315816693) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1315816639 - 2⁹ = 1315816127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1315816595 and 1315816604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1315856639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657908319 + 657908320.

It is an arithmetic number, because the mean of its divisors is an integer number (657908320).

Almost surely, 2^1315816639 is an apocalyptic number.

1315816639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315816639 is an equidigital number, since it uses as much as digits as its factorization.

1315816639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 43.

The square root of 1315816639 is about 36274.1869516051. The cubic root of 1315816639 is about 1095.8012494911.

The spelling of 1315816639 in words is "one billion, three hundred fifteen million, eight hundred sixteen thousand, six hundred thirty-nine".